Are you using a Mac or a PC? When you import or add the files did you check under Tones in the iTunes app?

See if you can go through the steps on this Support Page and make sure the tones are in the proper format.

I only have a Windows PC. The ringtones are in M4R format but when I go to ringtones and drag drop them, it shows a minus sign.

I then tried adding them to the music library and hit sync but none of them were copied.

all the guides I've read on the web are pretty much useless as they just show you how to convert a current song to a ringtone. The thing is, mine are already trimmed and are short ringtones in the M4R format I just want to copy them to the ringtones section in my phone